Gas gauge



FIG. 1 is an upper perspective view of the gas gauge showing my design.

FIG. 2 is a side view thereof;

FIG. 3 is an opposite side view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a front view thereof; and,

FIG. 7 is a back view thereof. 

I claim the ornamental design for a gas gauge, as shown and described. 